Welded exhaust pipe



P 9, 1940- o. H. BRAUER WELDED EXHAUST PIPE 'Filed Aug. 25. 193BINVENTOR O'rro H. BRAUER 65. 4 @4041,

ATTORNEY Patented Apr. 9, 1940 V UNITED STATES 2,196,694 WELDED EXHAUSTPlPE Otto H. Brauer, Three Rivers, Mich, assignor to Fairbanks, Morse &00.,[Chicago, 111., a corporation of Illinois Application August 25,

1 Claim.

This invention relates to conduit structures and more particularly to afabricated conduit assembly adapted as an exhaust discharge pipe forinternal combustion engines and the like.

The principal purpose of the invention is to provide an improved,fabricated exhaust pipe for engines of the type generally employed formoappear from thefollowingdescription and from the accompanying drawing,in which;

Fig. 1 is a plan .ortop-view' of a preferred embodiment of theinvention, a portion of the conduit structure being broken. away toillustrate certain structural features thereof; Fig. 2 is a sideelevation of the conduit shown in Fig. 1; Fig, 3 is an end elevation ofthe conduit, as viewed from the discharge end thereof, and Fig. 4 is atransverse sectional elevation of a portion of the conduit, as takenalong line 4-4 in Fig. 2.

Referring to the drawing by suitable reference characters, the improvedexhaust conduit which is particularly adapted to internal combustionengines employed for providing the motive power for railway motor carsand and the like, includes an angulate, sheet metal member lsubstantially U-shape in section, the member being formed preferablyfrom thin plate steel, as by stamping and pressing the plate stock tothe desired shape. Thus the member provides a rear wall II and sidewalls I2 which cooperate with other elements of thestructure'hereinafter to be described, to form the conduit.

Projecting from the open side of the member 45 I0 opposite the wall II,is a relatively deep channel member I3 which, like member ID, may beformed from thin sheet steel stock as by a stamping and pressingoperation. The member I3 provides a top wall l4 and side walls I5 forthe major length of the conduit. In forming the member 13, as bystamping, the side walls I5 are tapered somewhat, in the direction ofthe exhaust discharge end l6 of the conduit. Also, end portions of theside walls I5 adjacent the opposite endof the member are cut away asshown, leaving 1938,; Serial No. 226,692

. flanges I7 and end portions I8 by which the member I3 may be securedto the member III.

In the assembly of members It and I3, the forward vertical marginalportions I9 of side walls l2 which form part of member-l0, and theinclined upper margins 26 of the same side walls overlap respectively,the ends I8 of side walls I5 and the flanges I! on member I3. It is tobe notedthat in forming member I3, the rearward end portion ZI is turnedupwardly, being bent I along a transverse line 22 which issubstantiallyin register with the edges of side wallends I8.

I The degree of upward inclination thereof relative to the remainder ofmember I3, is,.by preference, in the present example, such that the top15 sur face of the portion 2i may lie flush with the inclined edges ofwall mar ins 20 on member H],

while the remainder of the member I3 projects from member 1- at an angleto the horizontal.

..;';1The inclination of conduit member l3to the hori-, zontal willdepend upon particular installations. of the exhaust duct, and incertain instances it may be desirableto arrange the member I3 in ahorizontal position. 1

After the members are so related, thelapped margins and flanges abovedescribed, arepreferably secured together as by spot-welding such asindicated at points 23. Spot-welding the'members together, whileeffecting a secure'and rigid connection, provides for greater economyand quicker assembly over bolting or a continuous weld along themargins, although the latter 1 methods of securement may be employed ifdesired.

The bottom closure for the conduit is provided by a relatively shallowchannel member 24 which, like the other members, may be formed from thinsheet steel stamped and pressed into the desired shape. The bottommember is inserted between the respective side walls I2 and I 5 of themembers I0 and I3, with its sides or legs 25 overlapped by the lowermargins of the saidside walls. Thus the wall portion 26 which forms thebottom of the conduit, lies inwardly or upwardlyv of the lower side walledges, leaving the sides 25 clear 45 for securement to the wall margins,as by spotwelding at the points 27. The rear end portion 28 of thebottom member is turned down to provide an additional flange which maybe spotwelded to the lower portion of the wall II on member It). It willbe noted from Fig. 2 that in the final assembly relation of the narts,lower marginal portions 29 of walls H and I2 project below the adjacentsection of bottom member 24. Although it is preferred to leave thesewall portions as shown, as they contribute to the rigidity of thestructure, nevertheless they may be removed or cut away if desired.However, this would require additional operations which would addsomewhat to the production costs, and hence for this reason these wallportions may be left on the structure.

The upper margin of top wall portion 2| of member i3 is spaced from theupper margin of wall H and these margins together with the upper marginsof the side walls l2 define an inlet port 30. Overlying these marginsand secured thereto, as by welding at 3|, is a plate 32 provided with anopening 33 in register with port 30. The plate is further provided withbo1t-' receiving apertures 34 for securing bolts (not shown) which serveto attach the conduit structure to the engine (not shown) with theaperture 33 and port 33 in register with the cylinder exhaust port (notshown).

It will now appear that the several members cooperate in forming aconduit passage 35 leading from the inlet port to the discharge port 36in the conduit end IS. The structural arrangement and assembly of theelements is such as to divide the passage into a chamber 31 ofsubstantial sectional area located adjacent the inlet port 33 and aconduit passage 38 of lesser sectional area, located between the chamberand discharge port 36, the latter passage converging toward the port 36.The chamber 31 serves as an expansion chamber wherein the exhaust gasesmay become cooled to a certain extent before discharge through passage38, the cooling of the gases resulting in an advantageous reduction inengine cylinder back pressure. It will be observed from Fig. 2, that theconduit passage 35 between the inlet and outlet ports, comprising thechamber 31 and passage section 38, is of angulate-trend as preferred inthe present example.

From the foregoing it will now appear that the exhaust conduit structurecomprises but four elements which are preformed and assembled togetherby welding, the resulting assembly being rigid and durable. Further, theconduit structure requires but a minimum of forming operations on itsparts as well as a minimum of assembly operations, thus enablingproductionof-the conduit at considerably reduced cost.

The present disclosure relates particularly'to a preferred embodiment ofthe invention, but it is to be understood that alterations ormodifications in the parts and assembly thereof may be readily efiectedas desired, without departing from the spirit and intended scope of theinvention as defined by the appended claim.

I claim:

An exhaust discharge conduit device for an internal combustion engine,comprised of wallforming elements preformed of relatively thin sheetmetal, welded together to provide a unitary conduit structure, saidelements including a U-shaped element, a relatively deep channel elementprojecting outwardly from the open side of said U-shaped element andprovided with a flanged-extension spanning a portion of the open side ofsaid U-shaped element, and a relatively shallow channel element disposedwithin the open side of said deep channel element and cooperatingtherewith to form a conduit passage tapering toward one end thereof,said last mentioned channel element having an end portion projectinginwardly of said U-shaped element,

said end portion and said flanged extension cooperating with theU-shaped element to form a chamberuin communication with said conduitpassage, the chamber so formed having a major sectional area greaterthan the greatest sectional area of said conduit passage.

OTTO H. BRAUER.

